# for i in range(1, 10):
#     for j in range(1, i+1):
#         print(j, "*", i, "=", i*j, end="")
#         print("\t", end="")
#     print("\n")

# print("请输入学生的人数：")#85,55,93,60,75,56,47,67,90,24,88
# n = eval(input())
# alist = eval(input())
# sum1 = 0
# a = 0
# sum2 = 0
# b = 0
# for j in range(0, n):
#     if alist[j] < 60:
#         sum1 += alist[j]
#         a += 1
#     elif alist[j] >= 85:
#         sum2 += alist[j]
#         b += 1
# if a == 0:
#     print("没有不及格的学生")
# else:
#     print("不及格的学生的平均成绩：%.1f" %(sum1/a))
# if b == 0:
#     print("没有优秀的学生")
# else:
#     print("优秀的学生的平均成绩：%.1f" %(sum2/b))

# import re
# my_str = input()
# my_str1 = my_str.lower()
# string = re.split(r'[.|,| ]', my_str1)
# strs = input().lower()
# count = 0
# for i in range(len(string)):
#     if strs == string[i]:
#         count += 1
# print(count)

# # 👇️ 用 3 个分隔符拆分字符串
# import re
# my_str = 'fql,jiyik-dot:com'
#
# my_list = re.split(r',|-|:', my_str)  # 👈️ comma, hyphen or colon
#
# print(my_list)  # 👉️ ['fql', 'jiyik', 'dot', 'com']

# alist = list(map(int, input().split()))
# print(sorted(alist, key=abs))

# alist = list(map(int,input().split()))
# alist.sort([2.0,1,-3] ,key = abs)
# print(alist)

# sorted([2.0,1,-3] ,key = abs)[2.0,1,-3]
# alist = eval(input())
# print(sorted(alist, key=abs, reverse=True))

# alist = eval(input())
# for i in range(len(alist)):
#     if max(alist) == alist[i]:
#         alist[0], alist[i] = alist[i], alist[0]
#     if min(alist) == alist[i]:
#         alist[len(alist)-1], alist[i] = alist[i], alist[len(alist)-1]
# print(alist)

# print(list(range(11, 21)))
# print(list(range(20,10,-1)))
# print(list(range(0,20,3)))
# print(list(range(18,-1,-3)))